Selecting a coupling scheme for each subband for estimation of coupling parameters in a transform coder for high quality audio
US6591241B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2000 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Sep 8, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/665
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for determining parameters for coupling of channels in a digital audio encoder. A frequency range of two audio channels is coupled together in a coupling channel, and a systematic method of determining optimum coupling parameters is employed. Sub-bands of the channels are processed individually, and a measure of the power of each sub-band is used to determine a coupling coefficient generation scheme for each individual sub-band. Adjacent ones of the sub-bands using the same coupling scheme are combined to form bands in the coupling channel, which dictate the generation of the coupling coordinates for the audio channels. The arrangement of the sub-bands in bands also facilitates the generation of phase flags for each band, on the basis of the coupling scheme used in the band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.